The Front End Software Engineer is responsible for the design and implementation of browser-based tools for trading infrastructure, focusing on high UX standards and creating libraries that capture common interaction idioms. The role involves building sophisticated UIs with web technologies, particularly using frameworks like Vue, Angular, React, and Flutter. A strong emphasis is placed on typed functional programming, with experience in languages like Elm and Typescript being advantageous. Opportunities exist to work across the stack, including front-ends, back-ends, middleware, and databases, while collaborating closely with traders and end-users. The goal is to deliver elegant and highly usable UIs that meet the needs of deeply engaged users.